I picked up a Sig Sauer P250 ODG CO2 .177 yesterday. Can't provide a full report yet, clearly...but it seems well built so far. Accurate enough, handles well and smashes holes into coke cans at 10 meters, so suits me fine.

I had an RWS C225 for a few years. Now that was a star, really well built, solid and accurate too. A really big chuck of metal.

I've had a Rat Catcher which was fun and surprisingly accurate and a bit of garden fun. It saw off a few rats but felt like it was poorly constructed and wobbly.